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Active sensing: Silencing the bat midbrain to study echolocation.
Curr Biol
December 2024
Faculty of Life Sciences, School of Zoology, and Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel. Electronic address:
A new method makes it possible to temporarily silence part of the bat midbrain while the animal is performing a sensorimotor task. Bats respond to this manipulation by increasing echolocation acquisition rate and adjusting their movement in a way that likely improves sensory acquisition.
View Article and Find Full Text PDFMicroseconds-level coding of echo delay in the auditory brainstem of an FM-echolocating bat.
J Neurophysiol
December 2024
Department of Neuroscience, Brown University, Providence, Rhode Island, United States.
Echolocating big brown bats () detect changes in ultrasonic echo delay with an acuity as sharp as 1 µs or less. How this perceptual feat is accomplished in the nervous system remains unresolved. Here, we examined the precision of latency registration (latency jitter) in neural population responses as a possible mechanism underlying the bat's hyperacuity.
View Article and Find Full Text PDFRapid sensorimotor adaptation to auditory midbrain silencing in free-flying bats.
Curr Biol
December 2024
Department of Psychological and Brain Sciences, Johns Hopkins University, Baltimore, MD 21218, USA; Kavli Neuroscience Discovery Institute, Johns Hopkins University, Baltimore, MD 21218, USA; The Solomon Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA; Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA.
Echolocating bats rely on rapid processing of auditory information to guide moment-to-moment decisions related to echolocation call design and flight path selection. The fidelity of sonar echoes, however, can be disrupted in natural settings due to occlusions, noise, and conspecific jamming signals. Behavioral sensorimotor adaptation to external blocks of relevant cues has been studied extensively, but little is known about adaptations that mitigate internal sensory flow interruption.
View Article and Find Full Text PDFPrevalent Harmonic Interaction in the Bat Inferior Colliculus.
J Neurosci
December 2024
Hubei Key Laboratory of Genetic Regulation & Integrative Biology, School of Life Sciences, Central China Normal University, Wuhan 430079, China
Animal vocalizations and human speech are typically characterized by a complex spectrotemporal structure, composed of multiple harmonics, and patterned as temporally organized sequences. However, auditory research often employed simple artificial acoustic stimuli or their combinations. Here we addressed the question of whether the neuronal responses to natural echolocation call sequences can be predicted by manipulated sequences of incomplete constituents at the midbrain inferior colliculus (IC).
View Article and Find Full Text PDFBackground noise responding neurons in the inferior colliculus of the CF-FM bat, Hipposideros pratti.
Hear Res
May 2023
Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, Wuhan, Hubei 430079, China. Electronic address:
The Lombard effect, referring to an involuntary rise in vocal intensity, is a widespread vertebrate mechanism that aims to maintain signal efficiency in response to ambient noise. Previous studies showed that the Lombard effect could be sufficiently implemented at subcortical levels and operated by continuously monitoring background noise, requiring some subcortical auditory sensitive neurons to have continuous responses to background noise. However, such neurons have not been well characterized.
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